/usr/bin/java -Xmx8000000000 -Xss4m -jar ./plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata ./data -tc ../../../trunk/examples/toolchains/AutomizerC.xml --traceabstraction.compute.interpolants.along.a.counterexample Craig_NestedInterpolation --traceabstraction.use.separate.solver.for.trace.checks true -s ../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf -i ../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c -------------------------------------------------------------------------------- This is Ultimate 0.2.0-7d8eed3 [2020-11-07 04:51:32,084 INFO L177 SettingsManager]: Resetting all preferences to default values... [2020-11-07 04:51:32,087 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2020-11-07 04:51:32,126 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2020-11-07 04:51:32,127 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2020-11-07 04:51:32,129 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2020-11-07 04:51:32,131 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2020-11-07 04:51:32,133 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2020-11-07 04:51:32,136 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2020-11-07 04:51:32,137 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2020-11-07 04:51:32,138 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2020-11-07 04:51:32,140 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2020-11-07 04:51:32,141 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2020-11-07 04:51:32,142 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2020-11-07 04:51:32,144 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2020-11-07 04:51:32,145 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2020-11-07 04:51:32,147 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2020-11-07 04:51:32,148 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2020-11-07 04:51:32,150 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2020-11-07 04:51:32,153 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2020-11-07 04:51:32,155 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2020-11-07 04:51:32,157 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2020-11-07 04:51:32,159 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2020-11-07 04:51:32,160 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2020-11-07 04:51:32,180 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... 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[2020-11-07 04:51:32,193 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2020-11-07 04:51:32,195 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2020-11-07 04:51:32,195 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2020-11-07 04:51:32,197 INFO L101 SettingsManager]: Beginning loading settings from /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/settings/automizer/acceleratedInterpolation/acceleratedInterpolationFastUPR_32.epf [2020-11-07 04:51:32,208 INFO L113 SettingsManager]: Loading preferences was successful [2020-11-07 04:51:32,209 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2020-11-07 04:51:32,210 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2020-11-07 04:51:32,211 INFO L138 SettingsManager]: * sizeof long=4 [2020-11-07 04:51:32,211 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2020-11-07 04:51:32,211 INFO L138 SettingsManager]: * sizeof POINTER=4 [2020-11-07 04:51:32,212 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2020-11-07 04:51:32,212 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2020-11-07 04:51:32,212 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2020-11-07 04:51:32,212 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2020-11-07 04:51:32,212 INFO L138 SettingsManager]: * sizeof long double=12 [2020-11-07 04:51:32,213 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2020-11-07 04:51:32,213 INFO L138 SettingsManager]: * Use constant arrays=true [2020-11-07 04:51:32,213 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2020-11-07 04:51:32,214 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2020-11-07 04:51:32,214 INFO L138 SettingsManager]: * Size of a code block=SingleStatement [2020-11-07 04:51:32,214 INFO L138 SettingsManager]: * To the following directory=./dump/ [2020-11-07 04:51:32,214 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2020-11-07 04:51:32,215 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 04:51:32,215 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2020-11-07 04:51:32,215 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=AcceleratedInterpolation [2020-11-07 04:51:32,215 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2020-11-07 04:51:32,216 INFO L138 SettingsManager]: * Use separate solver for trace checks=false WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Compute Interpolants along a Counterexample -> Craig_NestedInterpolation Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: Use separate solver for trace checks -> true [2020-11-07 04:51:32,604 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2020-11-07 04:51:32,637 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2020-11-07 04:51:32,640 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2020-11-07 04:51:32,641 INFO L271 PluginConnector]: Initializing CDTParser... [2020-11-07 04:51:32,642 INFO L275 PluginConnector]: CDTParser initialized [2020-11-07 04:51:32,643 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/../../../trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-11-07 04:51:32,734 INFO L220 CDTParser]: Created temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63939602/f6f0a4f4d9b14236a71859e64d20d1f5/FLAG49cc4d848 [2020-11-07 04:51:33,410 INFO L306 CDTParser]: Found 1 translation units. [2020-11-07 04:51:33,410 INFO L160 CDTParser]: Scanning /storage/repos/ultimate/trunk/examples/svcomp/recursive-simple/afterrec_2calls-1.c [2020-11-07 04:51:33,418 INFO L349 CDTParser]: About to delete temporary CDT project at /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63939602/f6f0a4f4d9b14236a71859e64d20d1f5/FLAG49cc4d848 [2020-11-07 04:51:33,774 INFO L357 CDTParser]: Successfully deleted /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/data/e63939602/f6f0a4f4d9b14236a71859e64d20d1f5 [2020-11-07 04:51:33,778 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2020-11-07 04:51:33,787 INFO L131 ToolchainWalker]: Walking toolchain with 4 elements. [2020-11-07 04:51:33,792 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2020-11-07 04:51:33,792 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2020-11-07 04:51:33,796 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2020-11-07 04:51:33,796 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:51:33" (1/1) ... [2020-11-07 04:51:33,800 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4216b8ec and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:33, skipping insertion in model container [2020-11-07 04:51:33,800 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 04:51:33" (1/1) ... [2020-11-07 04:51:33,808 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2020-11-07 04:51:33,823 INFO L178 MainTranslator]: Built tables and reachable declarations [2020-11-07 04:51:33,966 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 04:51:33,977 INFO L203 MainTranslator]: Completed pre-run [2020-11-07 04:51:33,993 INFO L206 PostProcessor]: Analyzing one entry point: main [2020-11-07 04:51:34,008 INFO L208 MainTranslator]: Completed translation [2020-11-07 04:51:34,008 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34 WrapperNode [2020-11-07 04:51:34,009 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2020-11-07 04:51:34,010 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2020-11-07 04:51:34,010 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2020-11-07 04:51:34,010 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2020-11-07 04:51:34,021 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,021 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,027 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,027 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,032 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,033 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,035 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... [2020-11-07 04:51:34,036 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2020-11-07 04:51:34,037 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2020-11-07 04:51:34,038 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2020-11-07 04:51:34,038 INFO L275 PluginConnector]: RCFGBuilder initialized [2020-11-07 04:51:34,039 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (1/1) ... No working directory specified, using /storage/repos/ultimate/releaseScripts/default/UAutomizer-linux/z3 Starting monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) Waiting until toolchain timeout for monitored process 1 with z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2020-11-07 04:51:34,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.init [2020-11-07 04:51:34,110 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2020-11-07 04:51:34,110 INFO L138 BoogieDeclarations]: Found implementation of procedure reach_error [2020-11-07 04:51:34,110 INFO L138 BoogieDeclarations]: Found implementation of procedure f [2020-11-07 04:51:34,111 INFO L138 BoogieDeclarations]: Found implementation of procedure f2 [2020-11-07 04:51:34,111 INFO L138 BoogieDeclarations]: Found implementation of procedure main [2020-11-07 04:51:34,111 INFO L130 BoogieDeclarations]: Found specification of procedure abort [2020-11-07 04:51:34,111 INFO L130 BoogieDeclarations]: Found specification of procedure __assert_fail [2020-11-07 04:51:34,111 INFO L130 BoogieDeclarations]: Found specification of procedure reach_error [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure f [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure f2 [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure main [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.init [2020-11-07 04:51:34,112 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2020-11-07 04:51:34,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2020-11-07 04:51:34,113 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2020-11-07 04:51:34,113 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2020-11-07 04:51:34,113 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2020-11-07 04:51:34,411 INFO L293 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2020-11-07 04:51:34,411 INFO L298 CfgBuilder]: Removed 0 assume(true) statements. [2020-11-07 04:51:34,413 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:51:34 BoogieIcfgContainer [2020-11-07 04:51:34,413 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2020-11-07 04:51:34,415 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2020-11-07 04:51:34,415 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2020-11-07 04:51:34,420 INFO L275 PluginConnector]: TraceAbstraction initialized [2020-11-07 04:51:34,420 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 04:51:33" (1/3) ... [2020-11-07 04:51:34,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37c7192 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:51:34, skipping insertion in model container [2020-11-07 04:51:34,422 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 04:51:34" (2/3) ... [2020-11-07 04:51:34,422 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@37c7192 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 04:51:34, skipping insertion in model container [2020-11-07 04:51:34,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 04:51:34" (3/3) ... [2020-11-07 04:51:34,425 INFO L111 eAbstractionObserver]: Analyzing ICFG afterrec_2calls-1.c [2020-11-07 04:51:34,463 INFO L179 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:Craig_NestedInterpolation Determinization: PREDICATE_ABSTRACTION [2020-11-07 04:51:34,472 INFO L191 ceAbstractionStarter]: Appying trace abstraction to program that has 1 error locations. [2020-11-07 04:51:34,503 INFO L253 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2020-11-07 04:51:34,556 INFO L377 AbstractCegarLoop]: Interprodecural is true [2020-11-07 04:51:34,556 INFO L378 AbstractCegarLoop]: Hoare is true [2020-11-07 04:51:34,556 INFO L379 AbstractCegarLoop]: Compute interpolants for Craig_NestedInterpolation [2020-11-07 04:51:34,556 INFO L380 AbstractCegarLoop]: Backedges is STRAIGHT_LINE [2020-11-07 04:51:34,557 INFO L381 AbstractCegarLoop]: Determinization is PREDICATE_ABSTRACTION [2020-11-07 04:51:34,557 INFO L382 AbstractCegarLoop]: Difference is false [2020-11-07 04:51:34,557 INFO L383 AbstractCegarLoop]: Minimize is MINIMIZE_SEVPA [2020-11-07 04:51:34,557 INFO L387 AbstractCegarLoop]: ======== Iteration 0==of CEGAR loop == AllErrorsAtOnce======== [2020-11-07 04:51:34,574 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states. [2020-11-07 04:51:34,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2020-11-07 04:51:34,590 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:51:34,591 INFO L422 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:51:34,592 INFO L429 AbstractCegarLoop]: === Iteration 1 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:51:34,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:51:34,602 INFO L82 PathProgramCache]: Analyzing trace with hash -590267415, now seen corresponding path program 1 times [2020-11-07 04:51:34,613 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:51:34,614 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [1578646471] [2020-11-07 04:51:34,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:51:34,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:51:35,134 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 0 [2020-11-07 04:51:35,148 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:51:35,175 INFO L375 atingTraceCheckCraig]: Compute interpolants for subsequence at non-pending call position 18 [2020-11-07 04:51:35,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2020-11-07 04:51:35,238 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2020-11-07 04:51:35,239 INFO L353 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModulePreferences [1578646471] [2020-11-07 04:51:35,241 INFO L219 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2020-11-07 04:51:35,242 INFO L232 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2020-11-07 04:51:35,242 INFO L155 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1884860773] [2020-11-07 04:51:35,248 INFO L461 AbstractCegarLoop]: Interpolant automaton has 9 states [2020-11-07 04:51:35,249 INFO L142 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy FIXED_PREFERENCES [2020-11-07 04:51:35,264 INFO L142 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2020-11-07 04:51:35,265 INFO L144 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2020-11-07 04:51:35,268 INFO L87 Difference]: Start difference. First operand 41 states. Second operand 9 states. [2020-11-07 04:51:35,829 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2020-11-07 04:51:35,829 INFO L93 Difference]: Finished difference Result 55 states and 63 transitions. [2020-11-07 04:51:35,830 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2020-11-07 04:51:35,831 INFO L78 Accepts]: Start accepts. Automaton has 9 states. Word has length 25 [2020-11-07 04:51:35,832 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2020-11-07 04:51:35,842 INFO L225 Difference]: With dead ends: 55 [2020-11-07 04:51:35,842 INFO L226 Difference]: Without dead ends: 39 [2020-11-07 04:51:35,846 INFO L677 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=71, Invalid=201, Unknown=0, NotChecked=0, Total=272 [2020-11-07 04:51:35,867 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2020-11-07 04:51:35,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 39. [2020-11-07 04:51:35,902 INFO L82 GeneralOperation]: Start removeUnreachable. Operand 39 states. [2020-11-07 04:51:35,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 39 states to 39 states and 40 transitions. [2020-11-07 04:51:35,906 INFO L78 Accepts]: Start accepts. Automaton has 39 states and 40 transitions. Word has length 25 [2020-11-07 04:51:35,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2020-11-07 04:51:35,907 INFO L481 AbstractCegarLoop]: Abstraction has 39 states and 40 transitions. [2020-11-07 04:51:35,907 INFO L482 AbstractCegarLoop]: Interpolant automaton has 9 states. [2020-11-07 04:51:35,907 INFO L276 IsEmpty]: Start isEmpty. Operand 39 states and 40 transitions. [2020-11-07 04:51:35,909 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2020-11-07 04:51:35,909 INFO L414 BasicCegarLoop]: Found error trace [2020-11-07 04:51:35,909 INFO L422 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2020-11-07 04:51:35,910 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2020-11-07 04:51:35,910 INFO L429 AbstractCegarLoop]: === Iteration 2 === [reach_errorErr0ASSERT_VIOLATIONERROR_FUNCTION]=== [2020-11-07 04:51:35,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2020-11-07 04:51:35,911 INFO L82 PathProgramCache]: Analyzing trace with hash -893167531, now seen corresponding path program 1 times [2020-11-07 04:51:35,911 INFO L162 FreeRefinementEngine]: Executing refinement strategy FIXED_PREFERENCES [2020-11-07 04:51:35,912 INFO L353 FreeRefinementEngine]: Using trace check IpTcStrategyModulePreferences [753653673] [2020-11-07 04:51:35,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2020-11-07 04:51:35,938 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 04:51:35,939 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 04:51:35,989 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is sat [2020-11-07 04:51:35,990 INFO L221 TraceCheck]: Trace is feasible, we will do another trace check, this time with branch encoders. [2020-11-07 04:51:36,028 INFO L173 FreeRefinementEngine]: Strategy FIXED_PREFERENCES found a feasible trace [2020-11-07 04:51:36,028 INFO L523 BasicCegarLoop]: Counterexample might be feasible [2020-11-07 04:51:36,030 WARN L518 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2020-11-07 04:51:36,068 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 07.11 04:51:36 BoogieIcfgContainer [2020-11-07 04:51:36,069 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2020-11-07 04:51:36,071 INFO L168 Benchmark]: Toolchain (without parser) took 2289.75 ms. Allocated memory was 151.0 MB in the beginning and 201.3 MB in the end (delta: 50.3 MB). Free memory was 127.6 MB in the beginning and 157.4 MB in the end (delta: -29.8 MB). Peak memory consumption was 21.4 MB. Max. memory is 8.0 GB. [2020-11-07 04:51:36,072 INFO L168 Benchmark]: CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.4 MB. There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 04:51:36,073 INFO L168 Benchmark]: CACSL2BoogieTranslator took 217.27 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 118.2 MB in the end (delta: 8.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. [2020-11-07 04:51:36,075 INFO L168 Benchmark]: Boogie Preprocessor took 26.87 ms. Allocated memory is still 151.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. [2020-11-07 04:51:36,076 INFO L168 Benchmark]: RCFGBuilder took 376.13 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 103.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. [2020-11-07 04:51:36,077 INFO L168 Benchmark]: TraceAbstraction took 1653.56 ms. Allocated memory was 151.0 MB in the beginning and 201.3 MB in the end (delta: 50.3 MB). Free memory was 103.1 MB in the beginning and 157.4 MB in the end (delta: -54.3 MB). There was no memory consumed. Max. memory is 8.0 GB. [2020-11-07 04:51:36,082 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.24 ms. Allocated memory is still 151.0 MB. Free memory is still 125.4 MB. There was no memory consumed. Max. memory is 8.0 GB. * CACSL2BoogieTranslator took 217.27 ms. Allocated memory is still 151.0 MB. Free memory was 126.9 MB in the beginning and 118.2 MB in the end (delta: 8.7 MB). Peak memory consumption was 9.4 MB. Max. memory is 8.0 GB. * Boogie Preprocessor took 26.87 ms. Allocated memory is still 151.0 MB. Free memory was 118.2 MB in the beginning and 116.8 MB in the end (delta: 1.4 MB). Peak memory consumption was 1.0 MB. Max. memory is 8.0 GB. * RCFGBuilder took 376.13 ms. Allocated memory is still 151.0 MB. Free memory was 116.8 MB in the beginning and 103.6 MB in the end (delta: 13.2 MB). Peak memory consumption was 13.6 MB. Max. memory is 8.0 GB. * TraceAbstraction took 1653.56 ms. Allocated memory was 151.0 MB in the beginning and 201.3 MB in the end (delta: 50.3 MB). Free memory was 103.1 MB in the beginning and 157.4 MB in the end (delta: -54.3 MB). There was no memory consumed. Max. memory is 8.0 GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - CounterExampleResult [Line: 3]: a call of __VERIFIER_error() is reachable a call of __VERIFIER_error() is reachable We found a FailurePath: [L23] CALL f(4) VAL [\old(n)=4] [L9] COND FALSE !(n<3) VAL [\old(n)=4, n=4] [L10] n-- VAL [\old(n)=4, n=3] [L11] CALL f2(n) VAL [\old(n)=3] [L16] COND FALSE !(n<3) VAL [\old(n)=3, n=3] [L17] n-- VAL [\old(n)=3, n=2] [L18] CALL f(n) VAL [\old(n)=2] [L9] COND TRUE n<3 VAL [\old(n)=2, n=2] [L18] RET f(n) VAL [\old(n)=3, n=2] [L19] CALL reach_error() [L3] __assert_fail("0", "afterrec_2calls-1.c", 3, "reach_error") - StatisticsResult: Ultimate Automizer benchmark data CFG has 6 procedures, 41 locations, 1 error locations. Started 1 CEGAR loops. VerificationResult: UNSAFE, OverallTime: 1.4s, OverallIterations: 2, TraceHistogramMax: 2, AutomataDifference: 0.5s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.0s, InitialAbstractionConstructionTime: 0.0s, HoareTripleCheckerStatistics: 25 SDtfs, 30 SDslu, 101 SDs, 0 SdLazy, 112 SolverSat, 13 SolverUnsat, 0 SolverUnknown, 0 SolverNotchecked, 0.1s Time, PredicateUnifierStatistics: 0 DeclaredPredicates, 19 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=41occurred in iteration=0, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 1 MinimizatonAttempts, 0 StatesRemovedByMinimization, 0 NontrivialMinimizations, HoareAnnotationStatistics: No data available, RefinementEngineStatistics: TRACE_CHECK: 0.0s SsaConstructionTime, 0.1s SatisfiabilityAnalysisTime, 0.4s InterpolantComputationTime, 56 NumberOfCodeBlocks, 56 NumberOfCodeBlocksAsserted, 2 NumberOfCheckSat, 24 ConstructedInterpolants, 0 QuantifiedInterpolants, 1728 SizeOfPredicates, 0 NumberOfNonLiveVariables, 0 ConjunctsInSsa, 0 ConjunctsInUnsatCore, 1 InterpolantComputations, 1 PerfectInterpolantSequences, 0/0 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: No data available, ReuseStatistics: No data available RESULT: Ultimate proved your program to be incorrect! Received shutdown request...